Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6068926 | Carbon brush and process for impregnating same | Rainer Sperling, Harald Friedrich | 2000-05-30 |
| 5798178 | Carbon brush and process for impregnating same | Rainer Sperling, Harald Friedrich | 1998-08-25 |
| 5488261 | Carbon brush and fastening a braided indicator wire therein | Anton Swoboda, Edmund Kubler, Horst Ulm | 1996-01-30 |